[Instrument for assessment of best practices in school food and nutrition units: from design to validation].

The scope of this study was to elaborate and validate an assessment tool for Best Practices in School Food and Nutrition Units. For this purpose a survey was conducted in the city of Santos (São Paulo - Brazil), in two stages: 1) Preparation of a Checklist for Best Practices in School Food and Nutrition Units (BPAE checklist). 2) Validation of the BPAE checklist.